<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <ul>
      <li v-for="(item,index) in str" :key="index">{{item}}</li>
    </ul>
    <button @click="add">走一走</button>
  </div>
  <script src="./vue-2.7.14.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        str: ['帅哥', '美女', '程序员']
      },
      methods: {
        add() {
          this.str.push(this.str.shift())
        }
      }
    })
  </script>
</body>

</html>